CVE-2021-34860: d-link dap-2020 Path Traversal

Vulnerability summary

CVE-2021-34860 is a medium (CVSS 6.5) Path Traversal vulnerability in d-link dap-2020. EPSS estimates a 1.46% chance of exploitation in the next 30 days, higher than 73% of scored vulnerabilities.

Timeline

1. 25-10-2021
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the getpage parameter provided to the webproc endpoint. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose information in the context of root. Was ZDI-CAN-12103.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.